---Dad, must we wait until the light becomes green?

---Yes, I’m afraid we ______. That’s the traffic rule.

A．can              B．may              C．have to           D．need

If nobody ____ the traffic rule, the Chinese style of crossing the road ____.

— Dad, must we wait until the light becomes green?

   — Yes, I’m afraid we ______. That’s the traffic rule.

A. can                         B. may              C. have to         D. need

If nobody ____ the traffic rule, the Chinese style of crossing the road ____.

A．will break; disappears                    B．breaks; disappears

C．breaks; will disappear                    D．will break; will disappear

You      drive on the right of the road in China. It’s the traffic rule.

A. must                    B. can                      C. will               D. may